BY R. J. TILLYARD. 47l 



pale olive-green, with dark basal patch; 10, very short, rounded, 

 pale; appendages very short, subconical, olive-green. Underside 

 with a black ventral stripe from 1-7, 8-10 pale whitish. 



Hab. — Atherton, N. Queensland (four males only; January, 

 1905) — Pallal, N.S.W., abundant on Horton River, December, 

 1910(many males and a fair numbe'r of females taken, of which 

 the type 9 above described is one); Bellinger River, N.8.W., 

 December, 1911. 



Types: $(^, Coll. Tillyard. 



The type-male from Atherton is a much smaller insect than 

 those from New South Wales; the males from Pallal average 

 32 mm. in length of abdomen, and 21mm. for hindwing(against 

 28 mm. and 18 mm. respectively for the Atherton series). The 

 colouring of the New South Wales examples is also fuller and 

 more brilliant. It is a most wonderfully beautiful insect, the 

 contrast of the golden-orange and sky-blue being almost beyond 

 description, as it skims its zigzag path in and out of the river- 

 banks, always very close to the surface of the water. 



40. Ceriagrion glabrum Burm. 



Selys, loc. cit., p.237; Tillyard, loc. cit., p.l91. 



In Plate xlix., figs. 17, 18, I have figured the appendages of a 

 male from Cairns, N. Queensland. Queensland specimens agree 

 in all particulars with Selys' description(types from Central and 

 South Africa) except in being of smaller size, and in the form of 

 the superior appendages of the male, which Selys calls "rewi/br»i"; 

 a word that might, with a little imagination, be allowed for the 

 profile view, but certainly not for the dorsal view. However, I 

 do not think this is an important difference, as de Selys evidently 

 intended to convey the idea of a rounded and somewhat "nodding" 

 appendage. 



These appendages should be contrasted with those of Xantho- 

 cnemis zela7idica(figs.l2, 13), when the very gi-eat difference will 

 be at once noted. The inferior appendages of C. fflabrum project 

 only just beyond the superiors. 



